眼科教学中存在的问题及探讨

结合实际教学经验,作者提出了眼科教学中存在的问题,并对其改进措施进行了探讨。针对目前多数教师在应用多媒体教学手段时存在的诸多问题,对多媒体教学进行了改进与实践。针对见习教学方式单一问题,对见习教学进行了改进和实践。最后指出,上述改进措施收到了良好的教学效果。     

改革教学方法调动学生学习的积极性

本文总结了作者多年教学经验，提出了启发与引导法、发现式学习法、演示法、归纳对比法、比喻举例法、教学实践证明，这些方法对于调动和提高学生的学习积极性，有一定的实际意义     

High-order harmonic generation of CO_2 with different vibrational modes in an intense laser field

We apply the strong-field Lewenstein model to demonstrate the high-order harmonic generation of CO_2 with three vibrational modes(balance vibration,bending vibration,and stretching vibration) driven by an intense laser field.The results show that the intensity of harmonic spectra is sensitive to molecular vibrational modes,and the high harmonic efficiency with stretching vibrational mode is the strongest.The underlying physical mechanism of the harmonic emission can be well explained by the corresponding ionization yield and the time-frequency analysis.Finally,we demonstrate the attosecond pulse generation with different vibrational modes and an isolated attosecond pulse with a duration of about 112 as is generated.     

Controlling the contributions to high-order harmonic generation from different nuclei of N_2 with an orthogonally polarized two-color laser field

The generation of high-order harmonic and the attosecond pulse of the N2 molecule with an orthogonally polarized two-color laser field are investigated by the strong-field Lewenstein model.We show that the control of contributions to high-order harmonic generation(HHG) from different nuclei is realized by properly selecting the relative phase.When the relative phase is chosen to be φ= 0.4π,the contribution to HHG from one nucleus is much more than that from another.Interference between two nuclei can be suppressed greatly; a supercontinuum spectrum of HHG appears from 40 e V to125 e V.The underlying physical mechanism is well explained by the time–frequency analysis and the semi-classical threestep model with a finite initial transverse velocity.By superposing several orders of harmonics,an isolated attosecond pulse with a duration of 80 as can be generated.     

阳极氧化法制备多孔氧化铝膜的形成过程研究

采用阳极氧化技术,研究了电压对多孔氧化铝膜生长过程的影响。使用扫描电镜(SEM)对在草酸-水-乙醇体系中形成的多孔氧化铝膜形貌进行观测。结果表明,在第二步氧化过程中,在40 V氧化电压下,多孔氧化铝膜的有序度和孔径随反应时间延长而降低;在80 V下,经过长时间反应,AAO膜表面腐蚀严重,难以获得平整的多孔结构。预氧化过程所形成的薄氧化层有效保护了多孔氧化铝表面,同时对多孔结构具有短距离诱导作用。改变氧化电压、电解质浓度和反应时间,有序孔排列的结构参数也有所改变。高电场下,孔道的相互作用促进了其生长分化,形成了两种不同的孔道结构。     

优化夫兰克-赫兹实验条件

利用改造后的第一代夫兰克-赫兹实验仪,通过计算机输入不同实验参量,得到相应实验条件的曲线及数据;在同一坐标界面中显示不同参量的多条实验曲线,分析了温度T、灯丝电压UF、第一栅极电压UG1K、阻滞电压UR及第二栅极电压UG2K对夫兰克-赫兹实验曲线形状及测量精度的影响,进而确定了各参量的最佳值.     

高职教育的“教学做”一体化探究

为创立更能适应知识社会需要、真正体现职业教育职业属性的教学模式,职业教育改革或转型仍在不断的探索当中。本文在综述国内外高职教育关于＂教学做＂一体化研究的基础上,按照要素重新定位和结构整合的思路,提出实施高职教育＂教学做＂一体化的配套措施。     

关于预防压疮的三级监控

为降低压疮的发生率，我院护理部在压疮管理上实行三级监控。即：护理部宏观监控、护士长关键性中间监控、责任护士微观控制。通过层层监控、环环落实，保证压疮病人得到及时有效护理，降低了压疮的发生。     

非均匀激光场中氢分子离子高次谐波的增强

通过数值求解非波恩-奥本海默近似下的一维含时薛定谔方程,研究了蝴蝶结型纳米结构基元中氢分子离子高次谐波的产生.研究表明,在蝴蝶结型纳米结构基元内部产生的非均匀场的空间位置对高次谐波的发射有较大影响.当非均匀场的空间位置从30 a.u.平移到-30 a.u.时,高次谐波的截止位置被延展且形成光滑的超连续的谐波谱,并应用时频分析方法、经典三步模型以及电离概率等解释了高次谐波发射的物理机理.研究了高次谐波谱对非均匀场空间位置的依赖性与载波包络值的关系,发现随着载波包络值的变化,非均匀场在不同空间位置处的高次谐波谱变化趋势相同.     

Carrier envelope phase effect on the spatial distribution of high-order harmonic generation in asymmetric molecule

The spatial distribution in high-order harmonic generation(HHG) from the asymmetric diatomic molecule He H~(2+) is investigated by numerically solving the non-Born–Oppenheimer time-dependent Schr?dinger equation(TDSE). The spatial distribution of the HHG spectra shows that there is little contribution in HHG around the geometric center of two nuclei(z = 1.17 a.u.) and the equilibrium internuclear position of the H nucleus(z = 3.11 a.u.). We demonstrate the carrier envelope phase(CEP) effect on the spatial distribution of HHG in a few-cycle laser pulse. The HHG process is investigated by the time evolution of the electronic density distribution. The time–frequency analysis of HHG from two nuclei in HeH~(2+) is presented to further explain the underlying physical mechanism.